Patents by Inventor Derek Appleby

Derek Appleby has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Dual disc pump
    Patent number: 6315532
    Abstract: A dual disc pump in which the suction disc is phased to lag by more than 180° behind the pressure disc.
    Type: Grant
    Filed: June 12, 2000
    Date of Patent: November 13, 2001
    Assignee: Alfa Laval Pumps Ltd.
    Inventor: Derek Appleby
  • Helical gear fluid machine
    Patent number: 5407337
    Abstract: A helical gear fluid machine comprises an inner rotary element (14) and an outer rotary element (15) and a casing (12), the rotary elements being mounted within the casing for rotation about mutually spaced fixed axes (17,16), The casing forms stationary inlet and outlet chambers (21,24) to the working section of the machine. The inner rotary element (14) is only supported for rotation by means of the outer rotary element (15) and by means of a coupling (28) with the drive shaft.
    Type: Grant
    Filed: May 25, 1994
    Date of Patent: April 18, 1995
    Assignee: Mono Pumps Limited
    Inventor: Derek Appleby